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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f46014cf49a60e0074ff8343bbac45ecc28ca71be37419c6d86eb4235e042b' 
  AND token = '/wpGuf4409awWRcXwAfih2As2qU8ydC60xd0p1uI3Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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