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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf677dcdc35eecfe9ef02be8ecd52f0e21f997e0e82772d4b294d8c0fa1331cc' 
  AND token = 's/V4JYvKOgcXEnMiYtd9dFnoWqmX92EpQz3C8OYV8gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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