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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40e78c260d23d5f9b4b0268097c4d328e594650edb75d8f479b03a99d52eb8f' 
  AND token = 'TQC6S+dJKTo4AA4FX61qy3/d7lHxopIGeoqecOIJZ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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