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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11784cbb4e0f1ad1e5b498cf6a2d3ff070b5175c900aa601dff54e30d8487478' 
  AND token = 'RmUmdsRcWMvKqx/NPt75PjMjC07gGfH4obE3JNCab/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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