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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117b87b44a22d6d6d265b3567d70630b2e50ddd20d330d57a818f0dbfd2a3fd2' 
  AND token = 'O6vALJY1cbr1Br/qXyhWGqWD/EJAs9cGi4XttbyXp5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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