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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826bdd70c5b0ec84c0f5d3b7307eb9407f42ad56660d0605fabe2898ff22d8aa' 
  AND token = 'LhzZXNcsSY9RdE5mGeW20AQL/5esxqmoQw/3Uv2u5f4=' 
  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"
    }
  }
}