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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5d3053c2d6e7538e96cc4326f2615744057aef6116830af2fb046127065fc1' 
  AND token = 'Su3oFXEuPEJib3ygUP8hxGjKST+R1mje69xSZA1fgqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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