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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1356f5f903cefc75a9a614fb1a0ac807cc95fc623fe5baf20f9a1e57a821b5fd' 
  AND token = 'n6cfCSr7p/J/6b7/+4LUXAyE5bTYzKdb3mrhkbr9a2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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