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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837d7e04b1ca464065ad198f66caa7a8d81f8372fbf0699b3241a1dbb9605128' 
  AND token = 'EsmmhMFZVJNKbosU8IjI9zOCUWeE4vxE/NiJfes1/To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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