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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2290e73d3bad4466e90238cb9f6a10da3e9aa999ecfc8c88108f89070833ac18' 
  AND token = 'mevaGNr+wNuaq7/6pQKq9p+bf9uTD3eLa7/IR8b/4vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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