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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0948b6ed6d6e92f8f41eca8b86bef9a29b258466d87c0915dcfeac956a2736' 
  AND token = 'sdUojhulUnLgBsRx8H+021YiGNfmLkgyqDmeP2+P+X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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