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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99bac2315a079c4c1853de1458f7880cdd70e461e10c2b64f6f87b354f5f1a7' 
  AND token = '6d241Lx+K2rONprtwyCJcUSRFeyc719N2YxdXvWsZwI=' 
  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"
    }
  }
}