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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483f97db59d7e71c6e09e6c06685f57efc039d69cd69e8d56868c6369aa3c77c' 
  AND token = 'OeMl8i+dF5Ov8SxM812sUZS4kO0zBroBIgY590zWQvU=' 
  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"
    }
  }
}