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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d4919239bee156651b1063b0ca9e314a41fe441ba2cf85edbc60df2f0e187c' 
  AND token = '43p6gEcw9/511DETVcT+LctdFXCtotMWLW1OZZWyWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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