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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4796d65e3639b1a44aff51ca23395993e989e11af227c73da5844e2d51f20f0a' 
  AND token = 'RmJFEzEr2P8MNST0lcxF5ZcKfbICPu8jegCQileBD4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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