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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf682e615247dedc37a6b26ad911578a6434554ef172d913cf2a7bd6f137508' 
  AND token = 'jBmryP+0Cb/X5Q41vD0isrMb7mGLSFcg8M8Aquq9GsE=' 
  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"
    }
  }
}