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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5f1b1a05ba84386af444afe12ee498c4938ed49a7bb42b2370a23c2a73cdbb' 
  AND token = 'la2uB3kNcw0F7dsdJXrxXHdBu/rh4x0c1F6yl0tqJNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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