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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6269db36c9dadcaf5b6ba7b08dccb4ef07909ecd17e2c878a7777e09ef88a90f' 
  AND token = 'nhp5CIyhD9DbmxDsx8m9xKYO+r2vdyzceDqmwh1AA4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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