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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c96694236c8d2248810492e1e11ae891340a4e3a0cac1666286754c4fdd5cad' 
  AND token = 'UZTnRxzA5L6lxHB12hV0hSJr7tyh71UqoR+AUlvsgP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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