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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a4f665bc2a129c26b78adf866c948ee48c3be63c43d262b5c42e4fc63d20b7' 
  AND token = 'HEnfcH+fN0UIRXCVSVnYUxq5e83wfUvXwSr/V1933ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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