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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebe5cab55b2dff65a2729b9704a846002d539bdf036ca6745e972562c7c0d5b' 
  AND token = 'a6i3J2VrOHCXI9uq4tVyINPLbWim320kpT06F5kdnAI=' 
  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"
    }
  }
}