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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9c41da48e25fcb6b6b7a95d50dff4ea0f9dddd09d968db75aee5625d79f17e' 
  AND token = 'T2hvi4/JqsnamynLuvDuzU74yKFLG/RcAG1l1Y5HtcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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