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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334106fb167d1f77c6395131ca755646cfb356fd4c4be5e6c06edd1098faa3d8' 
  AND token = '+n4M/2gOsnm76ll7jWef8e/bN6e1Hop+Xp9yGBbhPqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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