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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e261838922351fcc1ea866c09f227ea4443a96da35cc8119762cbdb06c85823a' 
  AND token = 'EpRjK+cGZRfSVKobbgPmcpJ9z1/ivnI5c81Iskyehk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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