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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c933a72300fb8d25c9d3115545bc39ee3210b0f7df3aee08102ed3f74d4dfe' 
  AND token = 'VpNjeGkz/flupc/Ngk7hgp0Ihg6EE6iRymN1Dp/XEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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