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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11c55a99874dcddb209479500a53f7ceb3857d13b1e72724c53a068836e86d4' 
  AND token = 'R9RuQbnPsow7+sVmUkX9ys1jfpaeMyPm/koaqk3pi7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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