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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf03e2219be0a489d73b753f4c4766348b28c10e61f6f9050bdba021acf7850f' 
  AND token = 'TGMjaUtNwi7d8Fxg+T4ZLl28NVaB3tD9ezjfue6Re7s=' 
  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"
    }
  }
}