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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a22e03ab5b7f9dbb1b881aa891ada133d919eb3623123e69c58713f66ec8d6' 
  AND token = 'N++HDDqJDJy6CK7bnuvqJFPxwewh2xLbLZmUFCvDEmk=' 
  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"
    }
  }
}