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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2738f5a9028bc3d8e81e49a2df57ca08e3faaec1cedb3212bc4765e2e085681' 
  AND token = '08HWb+OxftsEuC6k+onY4thD9H8gyHsfQjHYJFYfacE=' 
  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"
    }
  }
}