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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab59a0104288fee2db3d3fd02c5609b4762a87d2835bfcfbf2599d115fe2f62' 
  AND token = 'BwMoZWEH8dmxfNQFMLacdEimzux0m0NA4xG+M7lBdxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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