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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93e90763cddf77551e7bcf89b2d991a99af363635aecd915c0489405960b46b' 
  AND token = 'YEEoEE+b2B/fZrcrj7xe6nINvzDvf3s9xLbsLnn00t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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