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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbb9089c7b0dc6b034905a95a43da31f4e0d5fb2578bbef7ac8a8b1414bc2e3' 
  AND token = 'rpIB1GhjhOrd2fFc3G6e8R6kT119W5K5/2dq8kkwGeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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