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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94aa9d2fe8e598a099abe058842f1fcc7e6b7fc3c0f2c583df10efd860f8e72' 
  AND token = 'HwxfpeDnh62abyyIOW3xy2ygqgQusAggkdK9Z5v9R54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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