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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b16192996de34af37d4ae940bb437e1b30c7afdb649691451c9ede4a36fb7a' 
  AND token = 'vLfW0B5gmRP2xJ/6y5t/v+rE99cwDx7EnpRQR7rp8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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