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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11b7e7b7f31bf8ebe11a4e34351dddeb9d2af8ad9ba38902fd537cfce4b6461' 
  AND token = '5I13jv1x7dx+H2MFHMm6ihUmcN4F8680keNAN8wkDcE=' 
  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"
    }
  }
}