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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594643da9cf04d3f132fa5f8c6ab3e1b210dbd4d0ded00ea340a362639a66ce0' 
  AND token = 'ITJyY9maEURxetv7qRU4LBXp25QlCy6MxKBkg7jjNak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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