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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfc83c1d44193a3309c10c55eceaa09ec5ae9541536016d8a49444eb59c2509' 
  AND token = '1HIdYcyL34cL7TOATIIIrBdtJrZ60X/0cdmo70Imo18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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