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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1767c98aadd7d76f4e591c70874b676209a2d1f7e485c2b075b1db95a2951b' 
  AND token = 'iKapvi2QtzqbhdbCB41Rf8DOiBVHhwSI2hD/6eCKnZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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