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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ad452860f02420b8a4c3702ca9d915563b26248221fb06f2ba8d43a931c2bc' 
  AND token = '+Ar58d8qtKU4qLYRGwhYq7EqiUE3DdE1aqCPUBJ2SXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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