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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9070b2958e6629bf3831d45bbd4e94cfed72c4dbd3b1ff7ac90fe8bf211f288e' 
  AND token = 'q85LGpi6lQcHGzl7gEBdbOzGw5qpEii33pklXz90eW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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