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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa9cdadb487769dd78728223068a381f8b1a0c59708895f65d85a589114e802' 
  AND token = '1Ogm1n6UtazXIlTvb4HyP6jTO1O75NqGGxspwCeB7Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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