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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63173b73190ebdcb08f8c2dedd2fa4dbb976a20c3e182cfc670a15b3f9b1802' 
  AND token = 'NmKlKskdflThOTON/2/GM4PUHCR0gGx2QKJ2Mz6ibo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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