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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e971ba67e5158d54783b15ec1de5574fdb4325b1c73fe193c7a75a3157a89f' 
  AND token = 'hXSgkJ6ASzEkA3ovCJ8V6gf+DuGR/CEJCeBRtvMJ3so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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