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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76c330456019e2a11f797ddd489788d6b675d0359563d084a09c5e4c09d484d' 
  AND token = 'peonCqZN/TF2PlHBzz+QCQtnjENJ2fDnyxQjt6+XdoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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