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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d07d5318eef44d2e3b4190befbccdda3a9b659dce5e7410e2fbf2202f5a953' 
  AND token = 'kJ72+mZd724YKSM3Ju8RX0wpB02jCLNl/Z9RIUraFlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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