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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fef75a2d0d95d88ceab88e0f3af5b53028a719aef3e8496144a5342b23186af' 
  AND token = 'dEWPqfRyViXGhNO0+/54ALywiNbHh13P5WFy2TL00ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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