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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f039c3ce5767de2bca692b767e601a231a7e613194f84a2587592ee2efb95a54' 
  AND token = '10505bSEETYfFFLta3+MXR8fpUjpLftlyrJe4C1Lri4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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