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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ac52c0292f4408f3068c18a5caabc68b888e2976f79eb8495f33bb7c6f8ba1' 
  AND token = '97yQzl4r2+opfzk6GIeDdjUbBB/zMojdlDV1E2ShUuo=' 
  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"
    }
  }
}