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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bdd3f0110a64800d9d37d5143742740b58f6a6faf80cb74e6b26d4f31d670d' 
  AND token = 't6LQ5RNMpj7cQdP+p6vDH0ztCvKrofkJpEXqW85TTi4=' 
  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"
    }
  }
}