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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5759aa0da9f754085779f007fff8542cd5348171dafcc2740243a39eed435afc' 
  AND token = '2H4tLsSEjC8uBr4tZofs8gSWmsGTYQl5oJzMMNF2FkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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