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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1952bf2d5ab9f6b846981c1a0c1ddf0be7feff48321b92426637810be2d8f2' 
  AND token = 'QFeQ9LNqm19cVWLHc2ADakMRqtX4C6xZRKdSJHpDqUM=' 
  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"
    }
  }
}