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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec4ab0c4f57db60447e9489f4df07714cbb006797681c5e7661dad2b0928875' 
  AND token = '/+IqQ0k5CS1IGNLAH7z86kHFqLH/AK7bg9ie3tSYqLg=' 
  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"
    }
  }
}