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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f794a1b2c04bb4c8f0d524b6fdc49326231a8b0b09832ac6f54ca6536e475b' 
  AND token = '7J4O02xe66unp/zWeTI+CLyGiI/VRtXWZV56Yvs3pyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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