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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fea992f07f1a79743b4f2a0278ff66e4d6c9e3f2e9a46cb4be1c99f6eda75f3' 
  AND token = 'CRrpAwmRgtDn0ieoNJNnnjJaD6P8JyaZ381zLxMgo2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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