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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76d5d558ff8a46045c951db12d0ddd179bad4a1bf7034e7f2901ce9bd877af9' 
  AND token = 'sZTN/6g+c1IMhT9UB9VddDs9YzsivkIyMCXF7YnI0V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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