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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3d2d86ec3eb4ab5eed3a85dd2ec5bb30ea4cd8556c5143732ce66799942297' 
  AND token = 'NsAo6m3PqhQaeblw22aqN2pX+sMbaTHrImxQKMLsJXA=' 
  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"
    }
  }
}