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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e9fac7100d7f8413a2e94e710abec2ae8da44da4531869f0a55be8d16d18ba' 
  AND token = 'FLx7xpVMSyh35lFg7hTThuGDjZ7ISOu6Z0Sn0WJl+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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