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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d73c2b09b21aaf61243eeb87605a02d7bb435af62da42a96bc20af058e1ebb' 
  AND token = 'srTIsbQqntVMUnrnv27x5B8DJsG1AS8C0e93pnzXhPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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