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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee8a53c2ba146b2e4bd587d1007ba82eda77cc286d9a675744b1d42c119290a' 
  AND token = 'jEv/HUanYEt4Qqrmu91l5IV+A/NdQDFtrwm14KY5EI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}