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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd4c01a1cb6c103aee23f8a2ea4c31890e877e912c715f3ed7c828ad47e8782' 
  AND token = '35R/sc52k7txy48XIP59TCllCy62PfAWRDgvC7grf6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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