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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7498c7bf6d5a93703e13ca77faa43ee19783f3e8a04cccdc2f0d7d7080170859' 
  AND token = '60Qi/Uwwb55FhKVIB0aO9xVMHYhxBoSKgk+TyIEDHsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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