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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db60dbe938d391daaa769baf68eb55bb7cd9245cee34e7f3683004e4bd38a2b0' 
  AND token = '+8YU/LyR2nQ6CC5ieIYjAxvMaDJUssLi1Uq8aKB7UoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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